RFR(XS): 8145300: ppc64: fix port of "8072008: Emit direct call instead of linkTo* for recursive indy/MH.invoke* calls"

[Lindenmaier, Goetz]

Hi,

First, thanks for porting 8072008 to ppc. Good it came with a test,
that showed a small nit still was missing.
Ppc utilizes postalloc expand where Call nodes are expanded.
8072007 introduced field _override_symbolic_info to Call nodes that
needs to be preserved in postalloc expand.

Please review this small change:
http://cr.openjdk.java.net/~goetz/webrevs/8145300-jtregInvk/webrev.00/

Best regards,
  Goetz.
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